Add apromore license exception

[pombredanne]

See https://promtools.org/prom-6-framework-license/

[DennisClark]

new license LicenseRef-scancode-apromore-exception-2.0 created in DejaCode enterprise and public. Copyleft. @AyanSinhaMahapatra please synchronize when you have time, thanks.

[AyanSinhaMahapatra]

Added in #4278, added also to licensedb and license-expression v30.4.4 , closing.